uniform half4 colorRed, colorGreen;
uniform float unknownInput;

half4 main(float2 coords) {
    const float val = pow(1e38, 2);
    float4 y = val.xxxx;

    return (y.x == val) ? colorGreen : colorRed;
}

/*%%*
'const' variable initializer must be a constant expression
*%%*/